Semi-dull Bright High Shrinkage Polyester Chip HSPET for High Shrink Fiber

Precrystallized High Contraction Polyester Granular for Filament Yarn Spinning

High Shrinkage Polyester Chip (HSPET) is one modified or specialty polymer with a high shrinkage rate. It is obtained by adding a third or fourth monomer during the polymerization process. And we can provide precrystallized high shrinkage polyester chips. According to the content of TiO2, HSPET can be classified into three grades, that’s Bright, Semi-dull, and Full-dull.
It is mainly used for the production of high shrink polyester fiber and yarn.
There are two methods to produce high shrinkable fibers, chemical modification, and physical modification. The former has a relatively lower processing cost and the latter one has a higher shrinkage rate. But the principle of both ways is to reduce the crystallinity of the fiber molecular structure and increase the orientation of the amorphous area. Our product is applied in the chemical method.
The high shrinkage fiber is relative to the conventional shrinkage fiber. When the common fiber is heated, the shrinkage rate is usually no more than 10%. While the shrinkage rate of the high shrinkage fiber is generally more than 20%, even as high as 60% to 70%. The high-contraction polyester fiber is widely used for blending with other fibers. During the printing and dyeing process, it is heated and contracted. Then the ordinary fiber blended with it will be crimped and fluffy. As a result, the overall feel of fabrics is good and the sense of simulation is strong.

No. Property Unit Standard Value Test Result
1 Intrinsic Viscosity dl/g 0.722 ± 0.01 0.722
2 Melting Point 229±1 229
3 Color Value (b) 5 ± 1.5 4.36
4 Carboxyl End Groups (COOH) mol/t 18±3 17.8
5 Moisture Content % ≤0.4 0.065
6 Agglomerate Particle(>10um) pce/mg ≤2.0 0.5
7 Diethylene Glycol (DEG) W/% 1.6±0.3 1.55